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Harnessing speckle for a sub-femtometre resolved broadband wavemeter and laser stabilization

Author

Listed:
  • Nikolaus Klaus Metzger

    (SUPA, School of Physics and Astronomy, University of St Andrews)

  • Roman Spesyvtsev

    (SUPA, School of Physics and Astronomy, University of St Andrews)

  • Graham D. Bruce

    (SUPA, School of Physics and Astronomy, University of St Andrews)

  • Bill Miller

    (M Squared Lasers Ltd)

  • Gareth T. Maker

    (M Squared Lasers Ltd)

  • Graeme Malcolm

    (M Squared Lasers Ltd)

  • Michael Mazilu

    (SUPA, School of Physics and Astronomy, University of St Andrews)

  • Kishan Dholakia

    (SUPA, School of Physics and Astronomy, University of St Andrews)

Abstract

The accurate determination and control of the wavelength of light is fundamental to many fields of science. Speckle patterns resulting from the interference of multiple reflections in disordered media are well-known to scramble the information content of light by complex but linear processes. However, these patterns are, in fact, exceptionally rich in information about the illuminating source. We use a fibre-coupled integrating sphere to generate wavelength-dependent speckle patterns, in combination with algorithms based on the transmission matrix method and principal component analysis, to realize a broadband and sensitive wavemeter. We demonstrate sub-femtometre wavelength resolution at a centre wavelength of 780 nm, and a broad calibrated measurement range from 488 to 1,064 nm. This compares favourably to the performance of conventional wavemeters. Using this speckle wavemeter as part of a feedback loop, we stabilize a 780 nm diode laser to achieve a linewidth better than 1 MHz.

Suggested Citation

  • Nikolaus Klaus Metzger & Roman Spesyvtsev & Graham D. Bruce & Bill Miller & Gareth T. Maker & Graeme Malcolm & Michael Mazilu & Kishan Dholakia, 2017. "Harnessing speckle for a sub-femtometre resolved broadband wavemeter and laser stabilization," Nature Communications, Nature, vol. 8(1), pages 1-8, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15610
    DOI: 10.1038/ncomms15610
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